Accuracy is definitely questionable, but there should definitely be a downward trend observed in China considering people in the most heavily impacted regions have been locked down in their homes with extremely tight restrictions on when they are allowed to go out to get more groceries for nearly the past 2 months. With the viruses ~1-2 week incubation period, inhibiting its spread for 2 months should logically limit its ability to infect other people.

Such measures have only recently been enforced by Italy (and soon to be following in their steps are other European countries), and hopefully they will see similar downward trends about 2-3 weeks from when they enacted those quarantines.